Comparison of Sea Surface Dynamic Heights Estimated from Inverted Echo Sounder Data and Satellite Altimeter Data

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  • Kakinoki Koji
    Research Institute Applied Mechanics
  • Imawaki Shiro
    Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University | Research Institute Applied Mechanics
  • Ichikawa Kaoru
    Japan Agency for Marine-Earth Science and Technology | Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University | Research Institute Applied Mechanics
  • Umatani Shin-ichiro
    Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University | Research Institute Applied Mechanics

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Abstract

Sea surface dynamic height (SSDH) anomalies estimated from long-time inverted echo sounder (IES) data using gravest empirical mode method are compared with satellite altimeter data. The IES-derived SSDH anomalies agree well with the altimetric SSDH anomalies, although the IES-derived SSDH variation is slightly underestimated. We calculate power spectra of these SSDH anomalies to discuss time-scale dependency of their differences. The differences between two SSDH anomalies are found mainly caused by components with the periods from 50 days to 100 days, which correspond to meso-scale eddies or small meanders of the Kuroshio. These differences result in smaller variation of the IES-derived SSDH.

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